Dr. Margaret Mcmahon, MD
2160 S First Ave, (300 N York Rd, Elmhurst, Illinois 60126), Maywood, IL 60153 • +1-573-555-9468
Medical Education: Accredited U.S. Medical School (Class of 2011)
What This Doctor Actually Performs: CMS Medicare Utilization & Maywood Percentiles
NPI #1851366900 • CBSA Regional • Internal Medicine
Dr. Margaret Mcmahon, MD (NPI #1851366900) practices Internal Medicine in Maywood, IL (60153) with sub-specialty concentration in 21 Active CMS HCPCS Codes, recording 1,211 annual CMS services across 353 distinct beneficiaries—placing this practice as a upper-quartile active clinical volume (75th Maywood percentile) (-0.18σ vs IL state mean, 42.58th statewide percentile).
Procedural volume for Dr. Mcmahon is led by HCPCS 99214 (Moderate-to-High Complexity Internal Medicine Follow-Up — 545 annual services, $142–$195 GPCI cash estimate), followed by CPT 99213 (Established Preventive & Chronic Care Visit, 315/yr) and CPT 93000 (In-Office 12-Lead Resting Electrocardiogram, 157/yr).
Direct cash-pay transparency modeling sets Dr. Mcmahon's baseline new-consult rate near $218.00 in Maywood, IL (cash-pay accepted, hybrid in-clinic and telehealth video consults, 9-minute average reception wait).
NPI registry verification (#1851366900) confirms Dr. Margaret Mcmahon's MD standing serving CBSA 60153 with a 4.78/5 patient scorecard.
Compared against Maywood, IL Internal Medicine peers
1,211 annual services across 353 beneficiaries
Standard deviations from IL Internal Medicine mean utilization
Top Billed HCPCS/CPT Procedures & GPCI Self-Pay Cash Benchmarks
| HCPCS | Clinical Procedure Description | Annual Volume | Local Pct | Est. Cash Range |
|---|---|---|---|---|
| 99214 | Moderate-to-High Complexity Internal Medicine Follow-Up | 545 | 75th | $142 – $195 |
| 99213 | Established Preventive & Chronic Care Visit | 315 | 76th | $109 – $149 |
| 93000 | In-Office 12-Lead Resting Electrocardiogram | 157 | 70th | $52 – $71 |
| G0439 | Annual Preventive Wellness & Cardiometabolic Risk Assessment | 121 | 79th | $167 – $229 |
| 99204 | Comprehensive New Patient Internal Medicine Diagnostic Visit | 73 | 76th | $198 – $272 |
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Dr. Margaret Mcmahon, MD Fair Cash-Pay & Waiting-Room Scorecard
| Metric | Verified Benchmark | Source |
|---|---|---|
| Dr. Mcmahon National Provider Identifier | NPI #1851366900 (MD) | CMS NPPES Registry (60153) |
| Dr. Mcmahon Maywood CMS Volume Rank | 75.00th Pct (1,211 CMS svcs; Z -0.182σ) | CMS Medicare Part B (IL Internal Medicine) |
| Fair Cash-Pay New-Patient Benchmark | $218.00 (CPT 99204 GPCI Benchmark) | CMS Geographic Practice Cost Index (Maywood, IL) |
| Waiting-Room Wait Time & Cash Friendliness | $218.00 avg paid • 9 min lobby wait | 25 Anonymous Patient Reports |
| Listens Without Rushing & Modern Protocol Score | 4.84/5 Listening • 4.94/5 Modern Labs | CMS Provider Practice Cohort |
“Waiting Room” Patient Reality Scorecard
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